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New Mexico (NM) JR Journeyman Refrigeration
Exam Actual Test Questions and Correct Answers
With Rationales
Exam Coverage – NM JR Journeyman Refrigeration (Short Point Form)
• Refrigeration Cycles & Components (compressors, condensers, evaporators, metering devices)
• Refrigerants (types, properties, ODP/GWP, phase-out schedules, EPA 608)
• System Controls & Electrical (TXV, pressure controls, relays, capacitors, motors)
• Piping & Installation (materials, brazing, supports, insulation, NM Mechanical Code)
• Commissioning & Testing (pressure test, evacuation, superheat, subcooling, refrigerant
recovery)
• Safety & OSHA 29 CFR 1926 (confined space, lockout/tagout, PPE, refrigerant handling)
• Troubleshooting & Diagnostics (temperatures, pressures, electrical measurements)
• NM Specific Requirements (licensing, code amendments, continuing education)
Reference Materials Allowed in Exam (Open Book):
• New Mexico Mechanical Code (NMAC 14.9.2)
• Modern Refrigeration and Air Conditioning (20th or 22nd Edition)
• Uniform Mechanical Code (UMC) 2021
• IPT‘s Pipe Trades Handbook
• Industrial Refrigeration Handbook – Stoecker
• OSHA 29 CFR Part 1926
1. Which term describes heat added to a substance that changes its temperature without a phase
change?
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A) Latent heat
B) Sensible heat
C) Specific heat
D) Superheat
Answer: B
Rationale: Sensible heat raises or lowers the temperature of a substance while it remains in the same
phase. Latent heat causes phase change without temperature change .
2. What is the primary function of the compressor in a vapor-compression refrigeration cycle?
A) To expand the refrigerant
B) To remove heat from the refrigerant
C) To compress low-pressure vapor into high-pressure vapor
D) To filter the refrigerant
Answer: C
Rationale: The compressor increases the pressure and temperature of the refrigerant vapor, enabling
heat rejection in the condenser. It receives low-pressure vapor from the evaporator .
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3. R-410A is a blend of which two refrigerants?
A) R-22 and R-142b
B) R-32 and R-125
C) R-134a and R-600a
D) R-290 and R-600a
Answer: B
Rationale: R-410A is a near-azeotropic blend of R-32 and R-125, designed to replace R-22 in residential
and commercial air conditioning systems .
4. Which refrigerant is classified as an HCFC and is being phased out due to ozone depletion potential?
A) R-134a
B) R-410A
C) R-22
D) R-600a
Answer: C
Rationale: R-22 is a hydrochlorofluorocarbon (HCFC) with ozone depletion potential. Its production and
import have been phased out in the US under EPA regulations .
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5. In a refrigeration system, what occurs in the condenser?
A) Refrigerant absorbs heat and evaporates
B) Refrigerant rejects heat and changes from vapor to liquid
C) Refrigerant pressure drops rapidly
D) Refrigerant is compressed
Answer: B
Rationale: The condenser rejects heat from the high-pressure refrigerant vapor to the surroundings,
causing it to condense into a liquid .
6. What is the minimum work experience required to qualify for the NM Journeyman Refrigeration (JR)
certificate?
A) 1,000 hours
B) 2,000 hours
C) 4,000 hours
D) 8,000 hours
Answer: C
Rationale: New Mexico requires 4,000 hours (approximately two years) of practical work experience
under a licensed contractor for the Journeyman Refrigeration certificate .
New Mexico (NM) JR Journeyman Refrigeration
Exam Actual Test Questions and Correct Answers
With Rationales
Exam Coverage – NM JR Journeyman Refrigeration (Short Point Form)
• Refrigeration Cycles & Components (compressors, condensers, evaporators, metering devices)
• Refrigerants (types, properties, ODP/GWP, phase-out schedules, EPA 608)
• System Controls & Electrical (TXV, pressure controls, relays, capacitors, motors)
• Piping & Installation (materials, brazing, supports, insulation, NM Mechanical Code)
• Commissioning & Testing (pressure test, evacuation, superheat, subcooling, refrigerant
recovery)
• Safety & OSHA 29 CFR 1926 (confined space, lockout/tagout, PPE, refrigerant handling)
• Troubleshooting & Diagnostics (temperatures, pressures, electrical measurements)
• NM Specific Requirements (licensing, code amendments, continuing education)
Reference Materials Allowed in Exam (Open Book):
• New Mexico Mechanical Code (NMAC 14.9.2)
• Modern Refrigeration and Air Conditioning (20th or 22nd Edition)
• Uniform Mechanical Code (UMC) 2021
• IPT‘s Pipe Trades Handbook
• Industrial Refrigeration Handbook – Stoecker
• OSHA 29 CFR Part 1926
1. Which term describes heat added to a substance that changes its temperature without a phase
change?
, Page 2 of 109
A) Latent heat
B) Sensible heat
C) Specific heat
D) Superheat
Answer: B
Rationale: Sensible heat raises or lowers the temperature of a substance while it remains in the same
phase. Latent heat causes phase change without temperature change .
2. What is the primary function of the compressor in a vapor-compression refrigeration cycle?
A) To expand the refrigerant
B) To remove heat from the refrigerant
C) To compress low-pressure vapor into high-pressure vapor
D) To filter the refrigerant
Answer: C
Rationale: The compressor increases the pressure and temperature of the refrigerant vapor, enabling
heat rejection in the condenser. It receives low-pressure vapor from the evaporator .
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3. R-410A is a blend of which two refrigerants?
A) R-22 and R-142b
B) R-32 and R-125
C) R-134a and R-600a
D) R-290 and R-600a
Answer: B
Rationale: R-410A is a near-azeotropic blend of R-32 and R-125, designed to replace R-22 in residential
and commercial air conditioning systems .
4. Which refrigerant is classified as an HCFC and is being phased out due to ozone depletion potential?
A) R-134a
B) R-410A
C) R-22
D) R-600a
Answer: C
Rationale: R-22 is a hydrochlorofluorocarbon (HCFC) with ozone depletion potential. Its production and
import have been phased out in the US under EPA regulations .
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5. In a refrigeration system, what occurs in the condenser?
A) Refrigerant absorbs heat and evaporates
B) Refrigerant rejects heat and changes from vapor to liquid
C) Refrigerant pressure drops rapidly
D) Refrigerant is compressed
Answer: B
Rationale: The condenser rejects heat from the high-pressure refrigerant vapor to the surroundings,
causing it to condense into a liquid .
6. What is the minimum work experience required to qualify for the NM Journeyman Refrigeration (JR)
certificate?
A) 1,000 hours
B) 2,000 hours
C) 4,000 hours
D) 8,000 hours
Answer: C
Rationale: New Mexico requires 4,000 hours (approximately two years) of practical work experience
under a licensed contractor for the Journeyman Refrigeration certificate .
